HTML - <base>
The HTML <base> element specifies the base URL to use for all relative URLs contained within a document. There can be only one <base> element in a document.
Example
<base href="http://www.example.com/page.html"> <base target="_blank" href="http://www.example.com/page.html">
Description
The HTML <base> element specifies the base URL to use for all relative URLs contained within a document. There can be only one <base> element in a document.
The base URL of a document can be queried from a script using document.baseURI.
<base> elements are specified, only the first href and first target value are used; all others are ignored.| Content categories | Metadata content. |
|---|---|
| Permitted content | None, it is an empty element. |
| Tag omission | There must be no closing tag. |
| Permitted parent elements | Any <head> that doesn't contain any other <base> element |
| DOM interface | HTMLBaseElement |
Browser Compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | 1.0 (1.7 or earlier) [1] | (Yes) [2] | (Yes) | (Yes) |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | 1.0 (1.0) [1] | (Yes) | (Yes) | (Yes) |
[1] Support of relative URIs for href was added in Gecko 2.0 (Firefox 4.0)
[2] Before Internet Explorer 7, <base> could be positioned anywhere in the document and the nearest value of <base> was used. Support for relative URLs has been removed in Internet Explorer 8
Specifications
| Specification | Status | Comment |
|---|---|---|
| WHATWG HTML Living Standard The definition of '<base>' in that specification. |
Living Standard | No change since last snapshot. |
| HTML5 The definition of '<base>' in that specification. |
Recommendation | Specified the behavior of target |
| HTML 4.01 Specification The definition of '<base>' in that specification. |
Recommendation | Added the target attribute |
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/html/element/base